Lost admin username and password

I recently was given this IMAC for free, by the school I work for. Unfortunatly, the person who was at the time the main administrator did not leave his username and password. (He recently quit and moved out of state). Thus I cannot open files, add software, ect. Can I start over from the begining? Any help would be gracefully accepted.
Linda

if you have the installation disks handy, you can put the first disk in, restart the machine, and hold down the C key.
this will boot from the DVD/CD drive.
once the install wizard has started, go to the utilities menu, and select password change.
this will allow you to change the password for the admin user.
you could also reinstall the os entirely by going through the installation wizard (this assumes you do not want to keep any information on the machine)

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